If you can't compete, litigate. This train of thought has been quite prevalent among major technology companies as of late, most notably by Apple and Microsoft, who both cannot compete with Android on merit, so they have to resort to patent lawsuits and FUD. Both Asustek and Acer have revealed that Microsoft plans to impose royalty fees upon the two Taiwanese hardware makers to prevent them from shipping Android and/or Chrome OS devices.

I am no fan of Microsoft but asking a company to pay for a license fee for a patent you hold is perfectly legal.

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Really, even when they will* demand a cut of GLOBAL sales and not only the ones in the patent's jurisdiction? I.e if you live in a country where software patents are not valid, you will be paying MS for it. No wonder I refuse to buy a single license for MS's products(Ubuntu is the only OS installed on my machine). And when I have to use, I use a pirated version of anything from MS**.

This is more. An American company is using dubious American patent system rejected elsewhere to prevent foreign producers from entering American market with their solutions without paying a penalty fee.
This is nothing but kind of protectionism and should therefore be dealt with by some trade regulating international body.